Biology STAAR Practice Test 2025 – Comprehensive All-in-One Guide to Mastering the State of Texas Readiness Exam!

Question: 1 / 400

What are multiple alleles?

Traits determined by a single gene with two variations

Traits influenced by two genes only

Traits controlled by more than two alleles in a population

Multiple alleles refer to the existence of more than two different alleles for a single gene in a population. This means that for a particular gene, there can be several variations, each producing different phenotypes. A classic example is the ABO blood group system in humans, where the presence of A, B, and O alleles leads to four possible blood types: A, B, AB, and O.

Understanding this concept is crucial in genetics as it highlights the complexity of inheritance beyond simple dominant and recessive traits, which are typically determined by only two alleles. Recognizing multiple alleles allows for a deeper comprehension of genetic diversity within a population. The other choices do not accurately describe the concept; they either refer to traits governed by a limited number of alleles or suggest incorrect distinctions about genetic dominance.

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Traits that are recessive only

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